Device for gluing multi-ply products



p 29, 2- w. H. WILSV'ON ETAL 2,297,120

DEVICE FOR GLUING MULTI-PLY PRODUCTS Filed Sept. 14, 1940 Patented Sept. 29, 1942 OFFICE DEVICE FOR GLUING MULTI-PLY PRODUCTS William H. Wilson and George A. Ordway, Burlington, Vt.

Application September 14, 1940, Serial No. 356,860

2 Claims.

This invention relates to the manufacture of multi-ply products, such as spool heads, and relates more particularly to the effective securing of the plies of such products to each other. Certain new types of glue are now available which possess improved and very desirable qualities, such as water-proofness, but these new glues require not only pressure but also a substantial degree of heat in their application, in order to produce satisfactory results.

It is the general object of our invention to provide an improved method of gluing multi-ply products, by which method superposed plies of reasonable area may be quickly and firmly secured together, even when a glue is used which requires a considerable degree of heat, in addition to pressure during setting, such as a thermoplastic glue.

A further object of our invention is to provide improved devices for practicing our improved method. More specifically, we provide special discs or plates to be interposed between multi-ply products, which discs or plates are so formed that hot air or vapor may circulate readily therethrough and between said products, thus conveying heat in substantial quantities over the adjacent areas of said products while at the same time continuous and substantial pressure may be conveniently maintained on said products.

In the preierrred form, the plates or discs are of a sheet metal having good heat conductivity and are corrugated or otherwise formed to provide air-conducting cross channels or passages between adjacent spool heads. In the following description and claims, the term air" is to be understood as including also any other gas or vapor which forms a suitable heat-transferring medium.

Our invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

Preferred forms of the invention are shown in the drawing, in which Fig. 1 is a side elevation of a spool head assembly, embodying our improvements;

Fig. 2 is a plan view of one of the corrugated discs shown in Fig. 1;

Fig. 3 is a plan'view of a modified form of airconducting disc; and

Fig. 4 is a plan view, looking in the direction of the arrow 4 in Fig. 3.

Referring to Fig. 1, we have shown a plurality of multi-ply spool heads H assembled on a rod I having a head H at one end and having an elongated slot I2 in its opposite end portion. A heavy cast iron washer I4 is placed above the rod head II, and a second and similar washer I5 is placed under a wedge or key It which extends through the slot H2 in the rod I0.

Air-conducting sheet metal discs 29 are inserted adjacent each washer M or I5, and also between each two adjacent heads H. These discs 20 are stamped from relatively heavy sheet metal which has grooves or corrugations 22 (Fig. 2) extending across the same in parallel relation. When a disc is stamped from such a corrugated sheet, the grooves form unobstructed air-conducting passages extending across the disc from edge to edge thereof.

The sheet metal from which the discs are made is to be sufiiciently heavy so that it will resist displacement and will permit a heavy pressure to be applied to the heads H by driving in the wedge After a plurality of heads H and discs 20, with washers I4 and [5, have been thus assembled and firmly secured on a rod ID, the assembly is placed in an oven or is otherwise so disposed that a stream of highly-heated air or vapor will circulate about the assembly and particularly through the grooves or corrugations 22.

The hot air passing through these corrugations quickly heats the metal and the heat is transferred through the metal to the adjacent spool heads, which in turn are heated sufilciently to cause the glue interposed between the plies of the head to set and firmly adhere. The setting of the glue thus takes place under both heat and pressure, which is a requisite for certain modern kinds of glue, such as thermo-plastic type. Acttive circulation of the hot air will accelerate the setting action.

In Figs. 3 and 4 we have shown a modified airconducting and heating member comprising upper and lower plates 30 and 3| secured together in spaced relation by studs 32. With this construction, any desired amount of air-conducting space can be secured by varying the length of the studs 32 and the entire adjacent surfaces of the spool heads contact heated metal instead of part metal and part air, as in the construction previously described.

With either construction, the condition of the atmosphere in which setting of the glue occurs can be accurately controlled and the atmosphere may be dry for a quick setting operation, or may contain a certain amount of moisture so that the wood of the spool heads will remain more or less in normal condition during setting.

While the drawing shows two-ply spool heads only, a larger number ofplies can be used when desired.

Having thus described our invention and the advantages thereof, wedo not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what we claim is:

1. A spacing device for use in gluing superposed multi-ply products which comprises a generally flat impervious metal separating member 10 of substantial surface area and having transverse v air-conducting passages formed therein and parallel to the fiat surfaces of said member and extending from edge to edge thereof, each passage 

